Silver Blue John Cushion Ring. R406. This elegant ring, part of our Heritage handmade jewellery collection boasts a striking cabochon cushion shaped piece of rare Blue John stone that has been sourced directly from Treak Cliff Cavern in Castleton. The stone is framed within a simple Sterling Silver setting and completed with a classic Sterling Silver band. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen turn the raw Blue John stone into these stunning pieces of jewellery. You can find other matching Blue John jewellery and other Blue John rings online and instore. Silver Blue John Cushion Ring, dimensions stone 8mm